The steering wheel can be rotated and the steering wheel unlimited no action is mainly two-way diverter valve within the buffer failure or hydraulic cylinder piston ring damage. Replace the hydraulic cylinder piston seals; check valve Tai'an bidirectional buffer strongest excavators school, the valve body and the valve seat knit. Excavators, daily care and maintenance 1, slewing ring gear, the engine loose screws Tai'an excavators school address is required and coated plastic thread Tai'an biggest excavator schools must bear firmly. 2, all grease fittings, slewing ring, wiping every 10 Sky 15 days once the butter, different angles butter every 4-8 hours to play twice, each gear within the first 520 hours of work changed once, after 2 year replacement -3 times, the engine must be preheated for 10-15 minutes before work. Tyan's largest excavator schools | Kerry and excavators school (certified) | schools excavator by 泰安嘉 and Heavy Machinery Co., Taian Jia and Heavy Machinery Co., Ltd. (www.tajhzg.com/) is Tai'an, mining machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Heavy leader in Kerry and the staff warmly welcome all inquiries negotiations to create Kerry and heavy industry a better future.